Monday, March 11, 2019

Dual running EIGRP and OSPF - having issues

Hey everyone,

Would appreciate some help with a solution to dual running EIGRP and OSPF.

We have a current WAN that we use EIGRP on. We are getting a new WAN that will be using OSPF. Now EIGRP's AD is lower than OSPF's, so we need to change the AD for any route we learn through OSPF to be lower than EIGRP routes so that they are preferred.

I have configured something similar up in packet tracer, link to the diagram here: https://imgur.com/fAtaxdv

R1 is the router that I am changing the AD of the learnt OSPF routes on, specifically from R3. All routers have adjacencies in OSPF and EIGRP (respectively) with each other.

The problem I am facing is that R1 is still showing the route to 192.168.1.0/24 and 192.168.254.0/24 as being an EIGRP route, even though it is learning OSPF routes and correctly placing them in the routing table with an AD of 85. I believe the problem to be on R3, as the routing table on it is displaying 192.168.1.0/24 and 192.168.254.0/24 as being EIGRP routes. Would this prevent R2 from learning OSPF routes in those two networks from it or not?

If you need config or routing tables, please let me know. I have placed the routing config below and routing tables:

R1:

router eigrp 1

passive-interface default

no passive-interface FastEthernet0/0

no passive-interface FastEthernet0/1

network 172.16.254.0 0.0.0.255

network 172.16.1.0 0.0.0.255

network 10.255.250.0 0.0.0.255

network 10.255.255.0 0.0.0.255

no auto-summary

!

router ospf 1

log-adjacency-changes

network 10.255.255.0 0.0.0.255 area 0

network 172.16.254.0 0.0.0.255 area 0

network 172.16.1.0 0.0.0.255 area 0

network 10.255.250.0 0.0.0.255 area 0

distance 85 10.255.255.2 0.0.0.0

!

R2:

router ospf 2

log-adjacency-changes

network 10.254.0.0 0.0.255.255 area 0

network 10.1.0.0 0.0.255.255 area 0

network 10.255.245.0 0.0.0.255 area 0

network 10.255.255.0 0.0.0.255 area 0

!

R3:

router eigrp 1

passive-interface default

no passive-interface FastEthernet0/0

no passive-interface FastEthernet1/0

network 10.255.245.0 0.0.0.255

network 10.255.250.0 0.0.0.255

network 192.168.254.0

network 192.168.1.0

no auto-summary

!

router ospf 3

log-adjacency-changes

network 10.255.250.0 0.0.0.255 area 0

network 10.255.245.0 0.0.0.255 area 0

network 192.168.254.0 0.0.0.255 area 0

network 192.168.1.0 0.0.0.255 area 0

!

R1:

10.0.0.0/8 is variably subnetted, 5 subnets, 2 masks

O 10.1.0.0/16 [110/66] via 10.255.255.2, 00:00:02, Serial1/0

O 10.254.0.0/16 [85/65] via 10.255.255.2, 00:00:02, Serial1/0

D 10.255.245.0/24 [90/30720] via 10.255.250.2, 00:00:54, FastEthernet0/0

C 10.255.250.0/24 is directly connected, FastEthernet0/0

C 10.255.255.0/24 is directly connected, Serial1/0

172.16.0.0/24 is subnetted, 2 subnets

D 172.16.1.0 [90/25628160] via 172.16.254.2, 00:00:22, FastEthernet0/1

C 172.16.254.0 is directly connected, FastEthernet0/1

D 192.168.1.0/24 [90/25630720] via 10.255.250.2, 00:00:27, FastEthernet0/0

D 192.168.254.0/24 [90/30720] via 10.255.250.2, 00:00:54, FastEthernet0/0

R2:

10.0.0.0/8 is variably subnetted, 5 subnets, 2 masks

O 10.1.0.0/16 [110/2] via 10.254.0.2, 00:04:59, FastEthernet0/1

C 10.254.0.0/16 is directly connected, FastEthernet0/1

C 10.255.245.0/24 is directly connected, FastEthernet0/0

O 10.255.250.0/24 [110/65] via 10.255.255.1, 00:04:59, Serial1/0

C 10.255.255.0/24 is directly connected, Serial1/0

172.16.0.0/24 is subnetted, 2 subnets

O 172.16.1.0 [110/66] via 10.255.255.1, 00:04:59, Serial1/0

O 172.16.254.0 [110/65] via 10.255.255.1, 00:04:59, Serial1/0

O 192.168.254.0/24 [110/66] via 10.255.255.1, 00:04:59, Serial1/0

R3:

10.0.0.0/8 is variably subnetted, 5 subnets, 2 masks

O 10.1.0.0/16 [110/67] via 10.255.250.1, 00:05:15, FastEthernet0/0

O 10.254.0.0/16 [110/66] via 10.255.250.1, 00:05:15, FastEthernet0/0

C 10.255.245.0/24 is directly connected, FastEthernet0/1

C 10.255.250.0/24 is directly connected, FastEthernet0/0

D 10.255.255.0/24 [90/20514560] via 10.255.250.1, 00:06:00, FastEthernet0/0

172.16.0.0/24 is subnetted, 2 subnets

D 172.16.1.0 [90/25630720] via 10.255.250.1, 00:05:35, FastEthernet0/0

D 172.16.254.0 [90/30720] via 10.255.250.1, 00:06:07, FastEthernet0/0

D 192.168.1.0/24 [90/25628160] via 192.168.254.2, 00:05:40, FastEthernet1/0

C 192.168.254.0/24 is directly connected, FastEthernet1/0



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